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I noticed a small, painful bump on upper thigh near bikini line, what could it be?

Hi, For the past two or three weeks I have had a small, painful bump under the skin on my upper thigh. It's near my bikini line. I don't think it's an ingrown hair, because it feels different. I mainly feel pain when I touch it or if I cross my legs, or if my clothes rub against it. It is about the size of a bean but seems to be growing, but I can't see it. If it matters, I haven't had sex in about a month (my ex partner and I didn't use any protection, shame on me) and I did notice more discharge and discomfort than usual and a slight smell. This has never happened to me before and I'm pretty worried. I am planning to go to the doctor anyway, but what do you think?
There are multiple causes for small, palpable masses under the skin, and I recommend that you see your doctor for a formal evaluation to elucidate the cause of the mass on your leg. Given the location of the lesion, sexually transmitted diseases should be considered. Human papilloma virus (HPV) is the pathogen that causes genital warts, which can sometimes present as small cauliflower-like masses on the skin in the groin region. If there is ulceration of the skin, then syphillis and herpes can also cause lesions in this area. There are multiple other causes of palpable lumps. One of the most common diagnoses is lipoma, which is a benign growth of fat tissue in the subcutaneous layer under the skin. Lipomas feel like small, rounded, mobile and firm masses. They are usually painless and can be monitored. In rare cases, malignancy of the soft tissues can present as a small mass such as sarcoma. However, these are quite rare. They often present as rapidly growing and can be painful. Other causes include sub dermal nevi, which are essentially moles within the dermal layer of skin. Finally, infection of the skin such as ingrown or abscess can also lead to painful lumps on this skin. Your doctor will be able to evaluate your lesion and determine what may be the cause of the mass on your leg.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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