Conversation: The conversation between human and AI assistant.
[|Human|] I am 20 years old. I am a boy. One night my right arm started hurting, the top under part. There was nothing there. The next morning there was a bruise. This came from nowhere and is very very very painful. It is just getting bigger. The pain is spreading all the way down my arm and up to my chest. What could this be?
[|AI|]  Thanks for your question on Chat Doctor. I can understand your concern. Bruise with arm and chest pain is common with herpes zoster (virus) infection. It is common skin infection which involves nerves and skin. So Bruise with severe pain is suggestive of herpes zoster infection more. So better to consult Dermatologist and get done clinical examination of Bruise. You will need acyclovir (Anti-viral) tablet with pregabalin for nerve pain. Application of ice pack is also beneficial. Don't worry, you will be alright with all these in 2-3 weeks. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.