brown skin color inner thighs

okay i have a question an hope someone can help me with it. for the past month i have noticed a deep color change in my inner thighs. i am very white skinned an this has me worried. it does not itch, nor bother me just looks crazy cause i am all white an yet i have this brown in my inner thighs area. i have searched online for photos but so far not a dang thing looks like it at all an this has caused me concern. i am a 38 year old female an have not had sex in such a long time, so i don't think it would be any kind os STD unless i have caught something while on a comode or something. i dont have insurance an cant really afford a doctor. my income is only 350 per month. back in 2003 when i had insurance i was reguarly seeing a md because i have had many polyps removed from my colon. an for each year up to 3 years i had more each month but then the state got short on money an just started pulling people off the care an i was one that unfortantly stopped ghetting healthcare. i have not had a colonscopy for over 7 years now an i just recently noticed that not only do i have these brown areas on both my inner thighs but i have also noticed brioght red blood in my stool almost daily. i do have divertilouse an i know they bleed but wioth this inner thigh skin chanfge color i am really conserned.  my momk died of stomack cancer in 1988 an my dad last year had large b cell lymphoma cancer so cancer runs in my family. i have a photo but prefer to send it to a doc here in private.  please let me know what you may think it might be? thanks

[Bhupinder Kaur, MD]

Hello,
From your symptoms erythrasma needs to be ruled out. It is true that groins are effected but the typical appearance is well-demarcated, brown-red macular patches. The skin has a wrinkled appearance with fine scales.

It has to be differentiated from contact dermatitis, psoriasis, sweat dermatitis and fungal infections which may mimic it. Wood lamp examination and gram staining are the tests for its diagnosis.

So nothing can be confirmed without examination. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.