Device for draining an abscess, characterized in that it comprises: - a cannula, equipped with: - a proximal end designed to be inserted inside the body of a patient in a tissue affected by the abscess; and - a distal end designed to remain inside the patient's body; - a needle, equipped with: - a distal end, designed to remain inside the patient's body, - a proximal end, and - a point, located in the proximal end of the needle, and designed to be inserted inside the abscess until reaching a sac of pus; wherein the needle is configured so as to be longitudinally housed inside the cannula, according to a first position wherein the point protrudes from the proximal end of the cannula; as well as the needle can be displaced inside the cannula to a second position wherein the needle is outside the cannula, for separating the needle and the cannula from one another; and - a flap, located in the distal end of the cannula and protruding from the cannula towards the outside, the flap comprising: - a first through-bore to connect the flap to the cannula; and - an adhesive product, for fixing the cannula to the patient's body, so as to allow the patient to carry the device out of a health center. - a cannula, equipped with: - a proximal end designed to be inserted inside the body of a patient in a tissue affected by the abscess; and - a distal end designed to remain inside the patient's body; - a proximal end designed to be inserted inside the body of a patient in a tissue affected by the abscess; and - a distal end designed to remain inside the patient's body; - a needle, equipped with: - a distal end, designed to remain inside the patient's body, - a proximal end, and - a point, located in the proximal end of the needle, and designed to be inserted inside the abscess until reaching a sac of pus; wherein the needle is configured so as to be longitudinally housed inside the cannula, according to a first position wherein the point protrudes from the proximal end of the cannula; as well as the needle can be displaced inside the cannula to a second position wherein the needle is outside the cannula, for separating the needle and the cannula from one another; and - a distal end, designed to remain inside the patient's body, - a proximal end, and - a point, located in the proximal end of the needle, and designed to be inserted inside the abscess until reaching a sac of pus; wherein the needle is configured so as to be longitudinally housed inside the cannula, according to a first position wherein the point protrudes from the proximal end of the cannula; as well as the needle can be displaced inside the cannula to a second position wherein the needle is outside the cannula, for separating the needle and the cannula from one another; and - a flap, located in the distal end of the cannula and protruding from the cannula towards the outside, the flap comprising: - a first through-bore to connect the flap to the cannula; and - an adhesive product, for fixing the cannula to the patient's body, so as to allow the patient to carry the device out of a health center. - a first through-bore to connect the flap to the cannula; and - an adhesive product, for fixing the cannula to the patient's body, so as to allow the patient to carry the device out of a health center.