Is this gum lump over implant normal? Dentist said it was normal tissue healing. (photos)

The tissue appears to be healing normally. You will usually have a little bit of growth of the gum tissue over the implant. That will be removed and reshaped before taking any impressions. 

Existen muchos factores por los cuales pueda suceder, pero en su caso puede ser un signo de cicatrización normal, siga las instrucciones de su doctor ya en caso de tener dolor o presentar secreción en el área si son signos y síntomas que indiquen que esta fallando el implante.  

A lump over a dental implant can mean something significant like an infection.
In this case looking at the photos that you supplied, it looks however like that is some excess gum tissue that if still present when the implant is completely healed may need to be removed.
If that’s the case, it is not a major procedure and nothing to worry about.
I hope you found this information to be helpful,
Dr. Champagne