My son has had a sudden lump appear on his forehead just above his eyebrows, it's soft and the size of a 2p coin and he is complaining it is painful. I have taken him to GPS out of hours and he was seen by a nurse but could not explain what it could be and has told me to come back if it gets worse. He never bumped his head but was very distressed when he saw me upset as my car was involved in a hit and run while parked up. Could it be the stress that has caused this or can it be something else? Will it go a way?