Yes, it is possible for chlamydia to come back after treatment if the infection is not completely eradicated. This can occur if the initial treatment was not completed as prescribed or if reinfection occurs due to unprotected sexual contact with an infected partner. It is important to complete the full course of treatment as prescribed by a healthcare provider and to abstain from sexual activity until treatment is complete and all symptoms have resolved. It is also important for sexual partners to be tested and treated to prevent reinfection. Regular testing and practicing safe sex can help reduce the risk of acquiring or transmitting chlamydia.