I am a Muslim living in the US and few years back I was not on the right track and sinned and also got two tattoos. Does this mean now my prayers do not count or that my fasts during the Ramadan will not be accepted. However my main concern is that I want to perform Umrah and Hajj and the tattoos on my arm other on my back they would not be concealed.
Your consciousness about religion is commendable. As far as tattoos are concerned, it is better if you are able to do away with them. However, if you are not able to there is no need to fret over them. Your prayers and fasts would hopefully be counted because before God it is the sincerity of heart and mind that counts more than any other thing.
True repentance of a person spiritually cleanses him. Just as water physically cleans a person, repentance wipes out all sins and wrongs.