Are there any after effects of a corneal ulcer? can i wear contacts again after it heals?

Can be a problem: If the ulcer is treated properly it should heal nicely. The only long term effects come about if the ulcer was dead center in which case the vision will be disturbed. If off to the side, then you should have no problems. You can wear contact lenses after healing but keep to the cleaning and replacement schedule to prevent ulcer formation.