Welcome in H.C.M.
I have gone through your query regarding lump at axilla
and itching over body along with abnormal blood counts.
I think most likely your platelets count in blood is drop down therefor you have developed rashes in the body, and this may also be responsible for axillary lump.
Considering the above facts your complete hematological investigations are necessary like-
1- C.B.C., E.S.R., blood sugar (F & PP).
2- Bone marrow examination
3- Culture & Sensitivity of throat swab.
Inferences of above investigations will tell us about probable diagnosis and the line of treatment.