Question:
Dear Rabbi
On Shabbos, if one has a whitehead spot (a covering of white over a red spot), could one gently remove the white with a tissue if there will be no bleeding involved?
Answer:
One is allowed to squeeze a white head on Shabbos if one is careful not to squeeze fresh blood.
Sources:
Shabbos 3a, O:CH 328:28 & Mishnah Berurah 89
