Within a few days of an attack, a survivor's skin will often form white patches.  Eventually, these patches will become darker in color. Once the black and damaged skin has fallen off, the underlying skin will look raw, fleshy, red, and inflamed. People may continue to experience a burning sensation.

Acid attack survivors often experience suppressed immune systems and are therefore more susceptible to infections than they normally would be.

Acid attack survivors who have suffered from third-degree full thickness burns may lose their ability to maintain body temperature.  Acid can cause the skin to melt, shrink, and shrivel up. In some cases, the pores of the skin close up. When pores are closed, the body can't cool itself through sweating and starts having problems maintaining a consistent temperature.

Source: https://www.zwivel.com/blog/reconstructive-surgery-acid-attack-victims/

If acid is thrown around the face and skull region, hair loss may occur. Patches will form around the region where hair loss has occurred.

Acid may partially or fully destroy a survivor's lips. As a result, it may be difficult to perform basic actions such as eating or speaking.

A first-degree burn is an injury to the epidermis, the top layer of the skin. It is also known as a surface wound. A second-degree burn is an injury to the dermis, the second layer of skin. The dermis is underneath the epidermis. A second-degree burn is also known as a partial thickness injury. A third-degree burn is an injury affecting the third layer of skin (subcutaneous tissue) and is known as a full thickness burn. Fourth-degree burns affect the muscle, tendons, or bones of the individual. Acid attacks mostly cause third-degree and fourth-degree burns.

Source: https://www.webmd.com/first-aid/types-degrees-burns#1

Generally, there are three zones to a burn: The first is the zone of coagulation. This zone refers to the area of the burn that is the most damaged. It is usually found in the center of the burn. This area typically needs skin grafting, which is a process that involves moving skin from one area of the body to another part of the body.  The second zone is known as the zone of stasis. It usually surrounds the zone of coagulation. The tissue in this zone is more salvageable than the zone of coagulation. However, there are times where the tissue may not be recoverable as it depends on the severity of the burn case. The last zone is known as the zone of hyperaemia. This zone is the unburned section of the affected area. It may appear red because of inflammation. It can be found on the outside of the zone of stasis.

Source: Hettiaratchy, S., & Dziewulski, P. (2004). ABC of burns: pathophysiology and types of burns. BMJ (Clinical research ed.), 328(7453), 1427–1429. doi:10.1136/bmj.328.7453.1427

Debridement involves the removal of dead skin and damaged tissue. When burns injuries are healing, the affected areas can become surrounded with dead (necrotic) tissue, which can prevent the development of healthy tissue and lead to infections. Therefore, debridement helps facilitate the healing process.

Source: Burd, A., & Ahmed, K. (2010). The acute management of acid assault burns: A pragmatic approach. Indian journal of plastic surgery : official publication of the Association of Plastic Surgeons of India, 43(1), 29–33. doi:10.4103/0970-0358.63952

Skin grafting involves taking healthy skin and transferring it to another area of the body. Skin grafting is often used to treat severe burn injuries because the acid burns damages the skin so much that it loses its protective covering. The recovery time for split-thickness skin grafts is one to two weeks. The recovery time for full thickness skin grafts typically takes one to two months.

A blood transfusion involves blood being transferred to a patient via an intravenous (IV) line through the blood vessels. The purpose of a blood transfusion is to replace blood that was lost during a severe burn injury.

During this time, survivors are typically in the hospital and are administered pain medication. Some common pain medications include opioids, anti-inflammatory drugs, and anticonvulsants. Source: Castro, Rodrigo José Alencar de, Leal, Plínio Cunha, & Sakata, Rioko Kimiko. (2013). Pain management in burn patients. Revista Brasileira de Anestesiologia, 63(1), 154-158. https://dx.doi.org/10.1590/S0034-70942013000100013

Good nutrition is essential to burn healing, including the prevention of complications such as infection.  Metabolic rates typically increase (up to twice the normal level) in burn victims due to the body working harder to heal the wounds.  Carbohydrates, fats, and proteins are particularly important. Source: Williams, F. N., Branski, L. K., Jeschke, M. G., & Herndon, D. N. (2011). What, how, and how much should patients with burns be fed?. The Surgical clinics of North America, 91(3), 609-29.