Warts (Verruca)

It is an indurated, hyperkeratotic cutaneous proliferation resulting from the rapid multiplication of epidermal cells following inoculation by specific strains of the Human Papillomavirus (HPV) through microscopic abrasions in the skin.

Transmission occurs via direct person-to-person mucocutaneous contact with an infected lesion, or indirectly through fomites such as contaminated communal towels, footwear, public bathhouse surfaces, and razors.

A callus is generated strictly by repetitive mechanical friction or focal pressure (e.g., ill-fitting footwear) and possesses a central keratinous core. While plantar warts visually mimic calluses, they uniquely feature characteristic punctate black dots (thrombosed capillaries) on their surface and elicit disproportionately severe pain upon lateral compression.

Verrucae localized on the extremities harbor negligible oncogenic potential. Conversely, sexually transmitted genital warts induced by high-risk HPV genotypes carry a significant risk of progressing to cervical carcinoma in females and penile carcinoma in males, mandating rigorous clinical surveillance and intervention.

Particularly in the pediatric population, once the host immune system recognizes the viral antigen, a considerable proportion of warts may undergo spontaneous regression and resolution within months to a few years without therapeutic intervention.

Surgical excision or aggressive physical manipulation is generally avoided as it may disseminate viral particles. The foremost therapeutic modality is Cryotherapy, involving the precise application of liquid nitrogen (-196°C) to the lesion to induce epidermal necrosis via freezing. The treated verruca subsequently forms a crust and desquamates within days.