Hello...  This is Dr.  Pavan...  Glad to answer ur query.  Acne as such is a disease of skin,  due to the hormonal changes in body. Each person skin react differently to these changes.  Some people will be highly sensitive to it. Home remedies are nice only in few instances.  Applying the garlic might have caused the secondary bacterial infection.  This will require systemic antibiotic treatment and few topical skin care agents.