Pityriasis lichenoides has two different forms: acute and chronic. Sometimes these forms occur together. The acute form (PLEVA - pityriasis lichenoides et varioliformis acuta)can actually leave scars on the skin. Pityriasis lichenoides chronica (PLC) does not leave textural changes in the skin but can leave hyperpigmentation. In either form, pityriasis lichenoides can be challenging to control.
Treatment options for pityriasis lichenoides include oral antibiotics, topical steroids, non-steroidal anti-inflammatory preparations and ultraviolet light treatments. If the eruption is severe or not easily controlled with simpler options, sometimes immunosuppressive medications need to be used.
I am not able to diagnose medical conditions or suggest treatments without examining the patient. Please consult your dermatologist for diagnosis and treatment options.