Forehead acne, back acne ... Types of acne can include whiteheads, blackheads, pimples, and cystic acne or painful, pus-filled acne. Experts say that without any treatment, it typically takes ...
NBC Select associate updates editor Zoe Malin says she started using Differin gel for her hormonal and cystic acne as a teenager since it is the only OTC retinoid that does not require a prescription.