### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
hello, my daughter has a lump on the back of one of her legs on her calf. she says it doesn t hurt when she walks but if she touches or rubs it, it hurts terribly. i ve already seen our doctor and he says it must be some kind of infection that her body is fighting off. he gave her some antibiotics to take but she cannot take any antibiotics anymore because she has taken so much over the past few years. she gets so sick to her stomach and throws up. so, what do you think this is or is coming from? could it be a cist that should be removed? should she have an ultra sound? my daughter s immune system is very low. my husband and i adopted her from india when she was 3 years old and she was severely malnurished at the time. her health seems to be going down hill as she gets older. she is now 17. we have her on a good many vitamins already. our doctor suggested that she have a vitamin profile blood testing done to see if she is lacking certain vitamins or minerals. maybe she is taking the wrong vitamins for her body. please help! thanks, bonnie albury

### output:

Hi, dairy have gone through your question. I can understand your concern. Lump on back of leg can be some cyst, abscess or soft tissue tumor.  She should not take antibiotics without diagnosis.  She should go for fine needle aspiration cytology or biopsy of that lump. It will give you exact diagnosis.  Then she should take treatment accordingly. If she is malnourished then she should take high protein diet.  Check her vitamin profile and give her vitamin supplements according to need. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health.