The short version
- Some systemic infections declare themselves on skin before they declare themselves anywhere else.
- Syphilis is the classic case, known as the great imitator because it convincingly resembles acne, psoriasis, pityriasis rosea, lichen planus and drug reactions.
- The textbook description of a copper-colored rash is a description of lighter skin. In darker skin the same rash reads violaceous or hyperpigmented.
- US syphilis cases have declined two years running, and the total burden is still 13 percent above where it was a decade ago.
- An aesthetics practice is not a screening clinic. It should be able to notice when something is not cosmetic and say so.
This is not a topic most aesthetics practices write about, which is roughly why it is worth writing about.
The connection is not moral and it is not about lifestyle. It is anatomical. Skin is a large, visible organ that participates in systemic disease, and a practice that looks at faces all day will occasionally be the first place something systemic gets noticed. What matters is whether anyone in the room is equipped to notice it.
The great imitator
Syphilis has been called the great imitator for more than a century, because in its secondary stage it produces skin findings that convincingly resemble other conditions.
The classical presentation is a maculopapular rash involving the trunk, palms and soles. But the same infection also produces papulosquamous, annular, psoriasiform, pustular and follicular lesions, and the differential includes psoriasis, pityriasis rosea, lichen planus, drug eruption, sarcoidosis and viral exanthems.1
One item on that list matters more than the others in a practice like mine. Pustular facial lesions from secondary syphilis can be mistaken for acne vulgaris.1 Acne is among the most common reasons people walk into an aesthetics clinic, and a course of cosmetic treatment for acne that is not acne is a delay in treating an infection that is entirely curable with antibiotics.
The description that was written for lighter skin
Readers of this journal will recognize the next problem.
The teaching description of secondary syphilis is a copper-colored rash. That is what it looks like on lighter skin. In darker skin the same eruption appears violaceous or hyperpigmented, which does not match what most clinicians were taught to look for. The literature notes that trunk lesions may be less apparent in darker skin, while involvement of the palms and soles remains visible.1
So the practical instruction is to look at palms and soles, always, rather than to rely on a color description calibrated to one part of the population. This is the same failure mode we have described in the Fitzpatrick scale, in laser device research, and in the studies behind barrier function. Descriptive medicine built on a narrow sample misses things on everyone else.
Where the numbers actually stand
Worth stating accurately rather than dramatically, because the trend is genuinely mixed.
More than 2.2 million cases of chlamydia, gonorrhea and syphilis were reported in the United States in 2024, a 9 percent decline from 2023 and the third consecutive annual decline. Primary and secondary syphilis, the most infectious stages and the ones that produce the skin findings above, fell 22 percent from 2023.2
The qualifiers matter. The total burden remains about 13 percent higher than a decade ago, and congenital syphilis rose again, to nearly 4,000 cases, now roughly 700 percent above its level ten years ago.2
Read together: the epidemic is receding from a very high peak and has not returned to where it started. Which is the right amount of concern, neither a crisis headline nor a reason to stop looking.
What this means if you are the patient
Very little day to day, and one thing worth knowing.
If you are being treated for something on your skin and it is not responding the way it should, that is a reason to reconsider the diagnosis rather than escalate the treatment. Good treatment for the wrong problem produces exactly this pattern, and the most common mistake in aesthetics is to respond to a poor result with more intensity instead of a second look.
You do not need to volunteer your sexual history to an aesthetics practice, and nobody should make you feel you do. But if a clinician asks about it in the context of a rash that is not behaving, that is a reasonable clinical question and not an insinuation.
What this means for a practice
The obligation is narrow and real: recognize when something is not cosmetic.
That means examining skin rather than only the area being treated. It means treating a poor response as a diagnostic signal rather than a dosing problem. It means being willing to say that something needs evaluation elsewhere, and being specific about where, rather than continuing to sell treatment.
It also means the person making that call should be qualified to make it. This is one of the concrete arguments for physician involvement in aesthetic medicine, and it is not a marketing point. Recognizing that a facial eruption is not acne requires having seen things that are not acne.
Where the line is
An aesthetics practice is not a sexual health clinic, should not present itself as one, and cannot substitute for one.
We do not screen for infections, we do not manage them, and none of what is described here changes that. Testing and treatment belong with a primary care clinician or a sexual health service, and anyone who wants that care should get it from people who do it properly and routinely.
What a practice like this can reasonably offer is a clinician who looks at the whole of your skin, notices when something does not fit, and tells you plainly. That is a small contribution. It is also the specific contribution that gets missed when nobody in the room is trained to make it.
Common questions
Can sexually transmitted infections show up on your skin?
Yes. Several produce cutaneous findings, and syphilis is the classic example. In its secondary stage it produces a rash that characteristically involves the trunk, palms and soles, and it has been called the great imitator because it also appears as papulosquamous, annular, psoriasiform, pustular and follicular lesions resembling other skin conditions.
What is secondary syphilis mistaken for?
A wide range of conditions. The documented differential includes psoriasis, pityriasis rosea, lichen planus, drug eruption, sarcoidosis and viral exanthems. Pustular facial lesions can be mistaken for acne vulgaris, which is particularly relevant in an aesthetic setting, since treating acne that is not acne delays curative antibiotic treatment.
Does the rash look different in darker skin?
Yes, and this is a common source of missed diagnosis. The teaching description of a copper-colored rash describes lighter skin. In darker skin the same eruption appears violaceous or hyperpigmented, and trunk lesions may be less apparent. Involvement of the palms and soles remains visible, which is why examining those areas matters regardless of skin tone.
Are syphilis rates rising or falling?
Both, depending on the timeframe. Primary and secondary syphilis fell 22 percent from 2023 to 2024, the second consecutive annual decline, and total reported cases of chlamydia, gonorrhea and syphilis declined 9 percent to more than 2.2 million. However, the overall burden remains about 13 percent higher than a decade ago, and congenital syphilis rose again to nearly 4,000 cases, roughly 700 percent above its level ten years ago.
Should an aesthetics practice be screening for infections?
No. Screening, testing and treatment belong with primary care or a sexual health service. What an aesthetics practice should be able to do is recognize when a skin finding is not cosmetic, treat a poor response to appropriate treatment as a reason to reconsider the diagnosis rather than increase intensity, and refer specifically rather than continue treating.
What should I do if a skin treatment is not working?
Ask whether the diagnosis is right before agreeing to more intensive treatment. Good treatment applied to the wrong problem produces exactly the pattern of poor response, and escalating intensity is the most common wrong answer. A clinician asking about your broader health history in that context is doing appropriate diagnostic work rather than making an assumption about you.
References
- Chaudhry S, Akinlusi I, Shi T, Cervantes J. Secondary syphilis: pathophysiology, clinical manifestations, and diagnostic testing. Venereology. 2023;2(2):65-75.
- Centers for Disease Control and Prevention. Sexually Transmitted Infections Surveillance, 2024.
This article is for general education and is not medical advice. It does not establish a physician-patient relationship. Aahana does not provide screening, testing or treatment for sexually transmitted infections. Any new, persistent or unexplained rash should be evaluated in person by a clinician, and testing and treatment for infection should be arranged through primary care or a sexual health service.