Clustered red, pus-filled bumps may be due to a bacterial skin infection like folliculitis or a small boil (furuncle). If doxycycline (Dox) is not helping, the infection may need a different antibiotic or local treatment. Keep the area clean, avoid squeezing, apply warm compresses 2?3 times daily, and use an antiseptic or antibiotic ointment. If it is painful, spreading, or not improving in a few days, consult a doctor for proper evaluation, possible culture test, or drainage if needed.

A burning sensation during urination with a small ulcer at the tip of the penis may be due to a urinary or sexually transmitted infection, such as Urethritis or Genital Herpes. Since Doxycycline helped reduce the burning, but the ulcer is still present, it is important to consult a doctor for proper examination and tests. The doctor may recommend specific antibiotics, antiviral medicines, or topical treatment depending on the cause. Avoid sexual activity until the condition is properly treated, and maintain good hygiene.

Swelling of the lips and rashes after taking Minocycline may be an allergic reaction, which can be serious. Stop the medicine immediately and contact your doctor or go to the nearest medical centre. Antihistamines or corticosteroids may be needed to control the reaction. Avoid taking this antibiotic again, and always inform your doctor about this allergy in the future.