Background. The purpose of this study was to evaluate the effectiveness of Rational Emotive Behavior Therapy (REBT) principles to manage anger against the condition of alopecia suffered by participants. Anger is a feeling that everyone can feel. When a person feels angry indicates that they is in a dangerous, threatened, or hurt situation. Anger that serves as a mechanism for self-defense over the conflict. Although anger becomes a natural thing, angry expression must still be perform appropriately and not disrupt or harm others. Mistakes often occur when anger is associated with aggressive behavior, while anger can be expressed in a more assertive way. An expression of anger may arise in the special conditions experienced by some when a person has not received the physical disease he has, one of whom is a patient with alopecia. Alopecia makes a person experience baldness and can never have hair. The physical differences seen to be one of the triggers of a person are vulnerable to reactions from the environment. Alopecia patients who have not been able to accept deficiencies themselves and often get poor treatment of the environment tend to present an irritable self. Especially when the individual is not able to properly regulate his emotions tend to be expressed in the wrong way, specifically by doing aggressive actions. Participants in this study were a 9-year-old boy who still could not accept his alopecia condition. To cover his baldness, participants always wear a hat wherever he is and in any activity, including indoors. Participants are often harassed and get ridicule from friends at school. At the exposure of the condition, the participants grow into anxious individuals when they are in a new place, often think negatively of the person approaching them, and have automatic thoughts that are wrongly related to the head, whenever anyone asks about the hat that is always he wore, the participant immediately suspected the person would want to mock his bald head. The difficulty of self-acceptance from participants is caused by psychological development factors that begin entering the stage of adolescence. In the adolescent stage, they tend to resist differences with the peer, making it difficult for him to accept a condition of self that can not have hair. However, before entering the stage of acceptance, one must first be able to regulate himself. Therefore, the initial target of the participants is their ability to manage emotions and express anger in a more appropriate way. Interventions given to participants are interventions that can change a person's behavior based on the formation of cognitive and emotional processes. Interventions appropriate to these conditions are REBT.

Methods. The method in this research use single case subject A-B design. This study belongs to a quasi-experimental research that uses pre-test and post-test procedures to be able to know the effects or changes after treatment or intervention is given. Pre-test and post test procedures will see a change of score by comparing the scores of some measuring instruments used and the result of recording frequency of aggressive behavior at the time before and after the intervention is given. The anger variables were measured using Beck Anger Inventory for Youth (BANI-Y) and anger thermometer, while aggressive behavioral variables were measured using Child Behavior Checklist (CBCL), Eyeberg Child Behavior Inventory (ECBI), and record sheet to know the frequency change of aggressive behavior. Intervention conducted as much as 10 sessions with a maximum duration of meetings for 2 hours. In practice, the researcher adjusts the condition of the client in order to more easily understand the process of intervention, namely by creating a mind maping chart. The chart is designed to fit the cognitive stages of participants who are still in the concrete operational phase. In addition, during the study, mothers were also involved in observing participant behavior in responding to stimuli that could irritate her, specifically related to comments or reactions of others about hat and baldness. Mother conducted observations and recording on the task sheets assigned by the researcher.

Results. Researchers should build good relationships first with participants. It takes a long time (1.5 months with 7 times meetings) until the participant trusts the researcher and is able to tell her condition openly and unaccompanied mother. This condition is difficult because of the bad experience of participants who are often disappointed by their friends away from the participants after his friend told about the condition of his head. After the intervention, the participants have been able to identify a specific event, reveal the meaning of the event, reveal the mindset formed from the event, be aware of the emotional and behavioral consequences formed from the thought of an event, and able to change the mindset that irrational becomes more rational. The results of this study will continue to be monitored until participants apply new behavioral consequences based on a more rational mindset.

Conclusions. REBT declared effective to change the previously irrational mindset becomes more rational. This rational thinking makes the emotional regulation ability of participants more effective, resulting in a decrease in aggressive behavior when expressing anger.

Added-Values. The absence of a similar study that discusses anger management uses the principles of REBT in children in the middle childhood with conditions of alopecia disease or diseases that have permanent physical effects. From the research in outline gives positive results for the development of participants, which is more able to manage the anger. The difference with this study is that participants who have this disease to be a risk factor for him to be vulnerable to experience harassment from the environment. The situation is difficult to avoid, especially in the new environment. Therefore, in this study, researchers are very concerned with the well-being of participants by providing reinforcement whenever he can express his anger positively and motivation counseling if participants have not made positive changes.

Keywords: anger management; rational emotive behavior therapy; alopecia.