There are two gray things on the lemon peel in the picture, which are very similar to the previous scab. Lemon trees are not mature because of pests and diseases, and they can still be eaten.

If it is mold, it means that the pulp inside is beginning to rot and taste bad. The larger the mold area, the wider the rotten pulp will be until the mold covers the whole lemon fruit. You'd better not eat it. Lemon is a kind of fruit rich in water. Because the mold enters the pulp, it will expand the breeding range with the juice.