If you have been taking Microdox for years and still have folliculitis marks, it may be because long-term antibiotics alone don't always clear old scars or prevent new flare-ups. Folliculitis can be caused by bacteria, fungi, or skin irritation, and sometimes other treatments like topical creams, antiseptic washes, or dermatology procedures are needed. See a dermatologist to review your treatment and get a plan to reduce marks and prevent new ones.