Right shoulder pain

[Alessandro95]

4 months ago my right shoulder started giving me pain whenever I did pull ups.
Pain is there only when I do pull ups, or do the movement of pulling vertically with a small weight (30 kg at the lat machine).
It's not a huge pain but prevents me to do pull ups comfortably. It is located in the shoulder and in the armpit just above the tricep.
I stopped doing pull ups 4 months ago, rested completely for the last month. Pain is still there.
I do boxing 3-4 times a week for 1:30 hr, intensely. I use my right shoulder a lot, and I used to do pull ups once a week.
Have I damaged my cuff with over use?
Should I just keep training and not do pull ups?(that s what my coach said)
Should I not train at all for a while?
Should I wait if it gets better or seek medical attention?
I'm 25, always practiced sport 3-4 times a week,1 to 2 hours, rowing, gym, boxing.
Thank you for your help!

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