 [ Symptoms ] does the pertussis vaccination make you contagious  i will be getting the tdap vaccine can i be contagious to my 5month old grandson we will be visiting them in 9 days [ Disease ] i am seriously hampered by the fact i cannot seeexamine you first hand your description is just too vague for me to take blind guess but there are many skin disorders common in the groin area one of the most common would be tinea cruris jock itch again this is not a diagnostic guess but just a consideration you may need to see a dermatologist when the time is convenient