I’m sorry you are worried about a lump on your armpit.
I'm afraid we are unable to diagnose or tell anyone if anything is the matter. Lumps can have straightforward medical explanations such as infection. But only a doctor can make a medical assessment so the best thing to do is to make an appointment with your GP just to be on the safe side.
Because of the current pandemic, it’s more likely you will be offered a telephone appointment initially with your doctor. After the consultation, if they feel they need to see you, they can offer you a face to face appointment.
