One recent and severe exposure of UV radiation is not sufficient to cause skin cancer and malignancy. There are no statistics as such but definitely years of sun exposure increases the risk of skin cancer. Melanoma has an irregular border, is asymmetrical, uneven color and increasing in size. Keep an eye on the moles and freckles. If you notice changes in the mole's/mark’s color, height, size or shape, you should have a dermatologist evaluate it. You also should have it checked if it bleeds, oozes, itches, appear scaly, or become tender or painful.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Thanks for the response Dr.Kaur!