A tattoo in a dream often represents permanence -- a decision, belief, or identity you're marking as fixed and unlikely to change. Getting a new tattoo can reflect a form of self-expression you're ready to commit to, while regretting one may point to an old choice that no longer fits who you are.
In summer, when the Sun enters the terms of Mars, heat is caused; in winter, drought, and scarcity of rain and waters. - William Lilly (1602.-1681.)