Your skin lesion might be "erythema
nodosum". you should visit adermatologist or medicine specialist to find out the cause/ associated disease/infection. for releif your pain and bruise
like sweling you can take the following measures;
1. Take complete bed rest
2. take Tablet paracetamol500mg twice daily/ diclofenac
(e.g. Voltalin) 50 mg twice daily for 1 week after meal.
3. take an appropriate antibiotic like Tablet- ciprofloxacine 500mg twice daily for 1 week.
consult /visit specialist physician/ dermatologist 2 week later.