Hi doctor's. today i squeezed my right nipple, and a small amount of a clear substance came out. can you explain?

Sometimes happens.: Milk ducts are designed to secrete fluids and sometimes can produce a small drop under the right conditions. This is probably benign, but you should probably see doc to get a better history and collect more evidence. Most often this is nothings specific, but sometimes there is an underlying problem that needs further evaluation.