Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain a red pimple on the top lip can be due to bacterial infection while can also be due to inflamed
sebaceous gland or can be due to continuous rubbing causing friction and trauma while playing trumpet..
Whitish-yellow head is an indication that it is infected with formation of a pustule..
I would suggest you to apply
Triple antibiotic ointment over it..
Do cool compresses over it every 2 to 3 hours..
Avoid putting any trauma to it to prevent its exaggeration..
Do not lick it with the tongue to avoid chances of infection..
If it pains you can apply numbing gel containing Lignocaine and also take
Ibuprofen..
If still does not improve consult an Oral Physician and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..