Approximately 3–4 days after the prodromal symptoms, the typical exanthem of coalescing erythematous macules and papules ... to several petechial and purpuric exanthems, which may be localized ...

In the rare and atypical atrophic variant, the normal papules are replaced by flat violaceous macules that are found in the axillae and glans penis. Etiology: Lichen planus is a common ...