<s>[INST] hi my son is 11 months old and has had a very tiny lump since he was born just above his left ear but on sat i noticed it had got alot bigger and its hard took him to doctors and they done n xray today but i dont get the results back until wed and im worried sick they said they think its the way his skull is growing [/INST] Hello! Thank you for the query. If this lump is located under the skin bone growing is rather not the best idea. Lumps in such location are usually benign lesions. It can be a sebaceous cyst. Due to an infection, the cyst gets larger, very painful. Sometimes lymph nodes are located in mentioned area. The best way to find out what it is an ultrasound. In case of infection, it should be incised and Chat Doctor. Blood work should be also done to see the level of WBC. Hope this will help. Regards. </s>