Can a skin cancer growth appear overnight?

Changes in lesions: Cancerous changes occur in skin lesions over the course of time. It may not occur overnight.Periodic check ups necessary for suspicious skin lesions.

Yes: A skin cancer can appear suddenly overnight or be very slow growing or appear in a previously benign lesion. It can appear in previously completely normal skin and pop up suddenly and grow aggressively fast, or be slow growing. It can occur within a mole that you had for many years and then change.