Patients present numerous lesions of small papules that are dull red, dome shaped, hard, and usually not more than 2–4 mm in diameter. These lesions do not affect the face but affect lateral aspects of upper arms, shoulder girdle, back, and chest. The papules have an onset of 1–3 days after sun exposure and may last for many weeks. Comedones are not present in this type of skin reaction.
Acne aestivalis
Corpora arenacea
Acne conglobata
Anagen effluvium
Aromaticum rosatum
Ichthyosis hystrix
Tinea imbricata
Steatocystoma simplex