ConditionSkin, hair & nails
Lichen Nitidus
Lichen nitidus is a harmless, uncommon skin condition that causes clusters of tiny, shiny, flat-topped bumps the size of a pinhead. They are usually skin-colored, or lighter than surrounding skin on darker skin tones, and often appear on the arms, belly, chest or penis. It mostly affects children and young adults, is not contagious, usually causes little or no itch, and often fades on its own within a year or so. Treatment is optional.
Also called: Lichen nitidus of Pinkus, nitidus papules
At a glance
- What it is
- A benign inflammatory rash of tiny (1 to 2 mm), shiny, flat-topped bumps.
- Who gets it
- Mainly children and young adults; any skin type.
- Where
- Forearms, backs of hands, chest, belly, buttocks and penis; can be widespread.
- Symptoms
- Usually none; sometimes mild itch.
- Outlook
- Often clears within months to a few years without scarring. Treatment is optional.
When to get help
See a doctor within a day or two
- Bumps that become painful, crusted, oozing or pus-filled, or spread rapidly with fever
- Purple, flat bumps inside the mouth or on the gums together with a skin rash, which may be lichen planus rather than lichen nitidus
Book a routine appointment
- A new cluster of tiny bumps on a child's skin that has not been diagnosed
- Bumps on the penis or genitals, to confirm the cause and rule out infections such as warts or molluscum
- Itch that disturbs sleep or a rash that keeps spreading over several months
Usually safe to manage at home
- A diagnosed, non-itchy patch of lichen nitidus that is slowly fading
What lichen nitidus looks like
The bumps (papules) are distinctive once you know them:
- 1 to 2 mm across, about the size of a pinhead, and uniform in size
- Round, flat-topped and shiny, catching the light
- Skin-colored, pink or slightly yellow on lighter skin; often paler than the surrounding skin on brown or Black skin
- Grouped closely in clusters, but usually not merging into larger plaques
- Sometimes in a straight line where the skin was scratched or rubbed (the Koebner phenomenon)
Common sites are the inner forearms, wrists, backs of the hands, chest, abdomen, buttocks and the shaft or head of the penis. Palms, soles, nails and the inside of the mouth are rarely involved. A generalized form can cover large areas of the body.
What causes it
The cause is unknown. Under the microscope, each bump is a small, tight collection of immune cells just under the surface, held in place like a "ball in a claw". This suggests an immune reaction, but no trigger has been confirmed. It is not caused by infection, not contagious and not linked to hygiene.
Lichen nitidus was once thought to be a variant of lichen planus, and the two occasionally occur together, but most dermatologists now regard it as a separate condition. Rare associations have been reported with atopic dermatitis and Crohn's disease.
Lichen nitidus vs similar conditions
| Condition | Key differences |
|---|---|
| Lichen nitidus | Tiny, uniform, shiny, flat-topped; little itch; not contagious |
| Lichen planus | Larger, purple, very itchy bumps with fine white lines; often affects the mouth |
| Keratosis pilaris | Rough, gritty bumps around hair follicles on upper arms and thighs; not shiny |
| Molluscum contagiosum | Larger, dome-shaped bumps with a central dimple; contagious |
| Flat warts | Slightly larger, vary in size, often on the face and legs; contagious |
| Eczema (papular) | Itchy; dry, scaly skin around the bumps |
Diagnosis
A dermatologist can usually diagnose lichen nitidus by looking at the skin, often with a dermatoscope. A small skin biopsy confirms it when the appearance is not typical, because the "ball in claw" pattern under the microscope is characteristic. No blood tests are needed.
Treatment
Because lichen nitidus is harmless and often goes away on its own, many people choose no treatment. Options when it itches or is cosmetically bothersome:
- Moisturizers and gentle skin care to reduce irritation
- Topical corticosteroid creams for a few weeks to calm itch and inflammation
- Topical calcineurin inhibitors (tacrolimus or pimecrolimus), useful on the face, genitals and in children because they do not thin the skin
- Oral antihistamines for itch at night
- Narrowband UVB phototherapy for widespread or persistent cases
- Rarely, oral medicines such as retinoids for extensive, stubborn disease
Results vary, and the rash can come back after treatment stops. Avoid scratching and tight clothing over affected areas, which can spread bumps in lines.
Outlook
Lichen nitidus usually clears within months to a few years without leaving scars, though paler spots can last a while on darker skin. Generalized forms may persist longer. It does not turn into cancer and does not affect general health.
Frequently asked questions
Is lichen nitidus contagious?
No. Lichen nitidus is not caused by an infection and cannot be passed on by touch, sharing towels or sexual contact. That is one way it differs from molluscum and warts, which can look similar.
Does lichen nitidus go away on its own?
Usually, yes. Most cases fade without treatment within a few months to a few years and leave no scars. Treatment can speed up improvement or ease itch but is not required.
What is the best treatment for lichen nitidus?
There is no single best treatment. Mild topical steroids or calcineurin inhibitor creams are commonly used first for itchy or bothersome areas. Phototherapy helps widespread cases. Many people simply wait, since it often resolves by itself.
Is lichen nitidus on the penis an STI?
No. Lichen nitidus commonly appears on the penis but is not sexually transmitted and is not contagious. Because genital warts and molluscum can look similar, have a clinician examine new genital bumps to confirm the diagnosis.
Is lichen nitidus serious in children?
No. It is harmless and does not affect a child's health or growth. It may be noticed during bathing as tiny shiny bumps on the arms or belly. A pediatrician or dermatologist can confirm it, and most children need no treatment.
Sources
This guide was written from current patient and clinical guidance, including:
- American Osteopathic College of Dermatology: Lichen nitidus
- DermNet: Lichen nitidus
- StatPearls (NCBI): Lichen Nitidus
- Merck Manual Consumer Version: Lichen planus and related disorders
- American Academy of Dermatology: Bumps and growths in children