 [ Symptoms ] i have a cyst in my right hand and as it grows the tendinitis in my right foot gets worse is there a relationship  the cyst is between my thumb & pointer finger and the tendinitis is near my big toe joint between the big toe & the toe next to it i have had it drained once before & once drained the tendinitis went away i am a professional ballet dancer so most doctors instinctively think   pointe shoes i know the shoes aggravate the tendinitis but the fact that as the cyst becomes more prominent so does the pain just seems like there might be a relation any information would be greatly appreciated [ Disease ] i would not recommend giving any benadryl at this time for the itchy feet if your son was allergic to amoxicillin he would have developed a rash all over his body and it usually happens right after the first or second dose i would recommend using a moisturizing cream on his feet to help keep the skin on his feet moist and may also help with the itching