The rate and speed of muscle growth will determine how much it will stretch the tattoo. If muscles are to grow steady and slow, it might not make the tattoo stretch that much, but if the muscle growth is rapid and sudden, it is more likely to make a noticeable difference in the tattoo.

Rapid weight gain can stretch a tattoo, but unless you've gained a significant amount of weight, you generally won't see any dramatic changes in your tattoo's appearance. Stretch marks and loose skin are more likely to affect the look of your tattoo.

When tattoos are placed over a muscle, the tattoo may stretch if you subsequently increase the muscle mass in that area. Moderate muscle growth should not have any noticeable effect upon a tattoo. However, sudden or significant muscle growth may damage the design and ink of the tattoo.