Blemishes refer to imperfections on the skin, such as discolouration, spots, or marks, caused by various factors like hormonal changes, genetics, stress, skincare, diet, and environment.Our Anti-Blemish LED Pen is designed to treat mild to moderate acne, pimples, whiteheads, small cysts or nodules. However, it's not effective for treating pockmarks or indentations from previous spots, nor is it recommended for those with a history of melasma. If you have severe acne, please consult your doctor.