Keywords: 5-FU, 5-fluorouracil 2% solution; 5-fluorouracil; App, application; BCC, basal cell carcinoma; COVID-19; COVID-19, coronavirus disease 2019; IMI, imiquimod 5% cream; KCs, keratinocyte carcinomas; SCC, squamous cell carcinoma; TRET, tretinoin 0.1% cream; coronavirus disease 2019; imiquimod; keratinocyte carcinomas; social distancing; telemedicine; tretinoin.