Brother, It all Depends on the OIL carrier some are viscous then other which thicker some will absorb much quicker, Secondly SCAR TISSUE can cause slower absorption can create Lump, 3rd Depending on the compound can cause PIP which also can create Lump.
Utilizing warm cloth at the site injection can help to reduce. 2nd rotate the injection by allowing common site injections to break. The 3 primary are OIL carrier/ Scar Tissue/ BA/BB chemical solvent can create this type issue.