The dangers and side effects of mole removal are usually recurrence, mutation and secondary infection. Moles are benign proliferations of certain misshapen tumors or melanocytes. Mole spotting usually refers to the use of chemical corrosives, phototherapy, etc. to act on the skin where the mole is located so as to eliminate local pigmentation and improve the appearance. Currently, high-frequency electric knife, fractional laser and other photoelectric treatments are common. The possible hazards and side effects of mole spotting are as follows: 1. Recurrence: if the mole cells are not completely removed, it will cause the mole cells to proliferate again, which will result in the recurrence of pigmented mole. 2. Mutation: if the mole cells are not removed cleanly, there is a chance of cell mutation during the process of damage repair, and such mutated mole cells are the hidden danger of malignant melanoma, in which case timely surgical excision is also needed. 3. Secondary infection: local redness, swelling, heat and pain, oozing and other infectious manifestations may occur, and in serious cases, fever, fatigue and other systemic symptoms may occur. Timely anti-infection treatment is needed. Therefore, mole spotting has certain hazards and side effects, which must be considered clearly before mole spotting and should be treated in regular hospital dermatology department.