The initial stage of warts is when the new warts first appear. The lesions are usually single or multiple light red papules with sharp, soft tips. It is important to note that because the HPV-6, 11, 16, and 18 subtypes that cause warts mainly attack the moist skin-mucous membrane junction, in some patients with relatively low immune function, warts can also appear in the armpits, under the breasts, and between the toes, which are sweaty, moist skin folds. In addition, since there is an average incubation period of up to 3 months from the initial infection with HPV to the appearance of lesions, a subclinical infection that is not yet visible to the naked eye but is positive on the white acetate test can often be found around the initial rash.