HI,Welcome to HCM virtual clinic.
Going by your history of Triceps 
Sarcoidosis,new 
Biceps lump could be due to the Sarcodosis.
Diagnosis needs to be fixed by FNAC  
Biopsy from a Surgeon.
Treatment is by -Excision of the lump ,
with Vit D3 supplements  and 
Main pillar treatment with Steroid-
Prednisone.
This would need to taken under guidance of your treating doctor.
Shoulder discofort for 1 yr,seems to be from Biceps Sarcoidosis.
Sarcoidosis is a 
benign granuloma of auto-immune origin and need not be worried of being Cancer.
This would help you to plan treatment with your doctor.
Hit Thanks.
Will appreciate to find your review comment write up.
Good Day!!
Dr.Savaskar M.N.
M.S.Genl-CVTS.
Senior Surgical Specialist.