<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi I took my first trimix shot tonight at 9.30. .25 on the syringe. Got very hard in 5 min. I m still hard and it s 12.50 am. I took Benadryl at 11.30. And 4 sudafeds 10mg each at 12.30am. Even cold shower. What should I do thanks ken fisher age 44 good health no surgeries. Thank you  <response>: Hi, thanks for writing to Chat Doctor. Well, If I were your family physician for this case of a hard lump due to an injection, I would think about injecting into fat space or fascia or some thin vessel has been punctured!therefore you need to apply ice packcold compress with mild massage... Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. 