Can you loosen the staps to put less pressure over that area?
In the past many gals had to resort to the cami tops with the built in bra. And layering tops to pervent show thru.

Or a sport type bra with wider strap to spred the pressure over a larger area.

It usually is because that stap puts just enough extra pressure downward that it is irritating & compressing the nerve & vascular bundles that run under the area.