Welcome and thanks for posting your query to Healthcare Magic.
As per your query you have lump under sternum
with mild pain that eases on pressing.
As per your query the most probable possibility appears to be "sebaceous cyst" at the sternal area.
These are the collection of cheezy material in the oil gland which formed due to blockage of oil glands.
For the betterment kindly follow the suggestions below:
-Do not try to touch or scratch or pinch the area as can lead to secondary infection.
- You can apply topical antibiotic
cream such as "mupirocin" or fucidin
in thin layer two times a day.
As there is discharge from the area so it would be better that it should be shown to either a dermatologist
or surgeon who can take it out by simple excision.
Hope these information will help. If you have further queries I will be happy to help.
"With good health wishes"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)