i have a rash behind my kneesitching behind knees no rashburning rash behind kneesrash on thighs and behind kneesrash behind knees and armpitsfungal rash behind kneesitchy rash back of kneepainful rash behind kneerash behind knees in adultsrash on back of leg behind kneeskin rash behind kneessweat rash behind knees