Are you allowed to shave after Lag Ba’omer or only some customs say you do?
There are a couple customs: 1. Not shaving from Pessach until Lag Ba'omer. 2. Not shaving from Rosh Chodesh Iyar until three days before Shavu'ot. according to this custom your not allowed to shave after Lag Ba'omer. 3. Not shaving during the whole Omer (Arizal). Rabbi Binyamin Bamberger.