Hello,
You have a history of having painful boils and scars, and also have 
allergy to 
oral antibiotics and also to 
topical antibiotic based creams, you are suggested to take care of your hygiene. Use a separate face cloth and towel. Do not share your toiletries. Apply turmeric paste in water on the boils and scars. leave it to dry for some time and take bath. Do this twice daily.
Or take bath with herbal antibacterial soap (if it suits you) at least twice a day. After patting dry apply a thin layer of mild 
aloe vera based moisturizer or neem oil. You can take blood purifying tonics. Avoid food that produces a lot of heat like red meat, black pepper, ginger, garlic, onion, etc. Take food like cucumbers, coconut waters, yogurt, peppermint, mint, 
vitamin C rich food, lean mean, small fishes, etc. Avoid perfumed and chemical based cosmetic lotions. Wash your personal clothes and bedding in hot water frequently.
The scars may take time but it will go away with time (for faster removal you may have to take 
laser treatment by dermatologists).  However, your symptoms could be indicative of serious medical conditions like herpes, neurological, lymphatic causes, malignant cause. You are suggested to get clinically examined by a GP, get STD tests, blood and 
urinalysis, imaging tests done to stay on the safer side. Get treated if the tests come positive.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician