30 years ago when I was in transmission (High Voltage Transmission) we were bathed in tresnformer oil, and I pulled the papers on oil and skin cancer...was particularly interested, and that we were bathing in very very clean oil..and I used coal tar soap..and did my own mechanicing...
Mice, shaved, skin abraded, and a high cyclic aromatic content bitumen applied daily...they got cancer...regularly.
Transformer oil, the olides who bathed in it didn't show anything.
An oil change every few months, or a couple of times a week, I care less..if I spill used engine oil on my clothes...I finish, and then wash/shower.
Nothing that a weekend handyman is doing is of any reasonable consequence with regard to used oil exposure.