I have a brown color change in some parts my leg...

What is the treatment of Skin changes ?
You should do clinical assessment in the nearest medical center as you have to avoid scratching the skin as much as you can and to Wear comfortable and clothes that are made of cotton and you should avoid wearing tight clothes
Pay attention to your personal hygiene and Use creams such as Triderm twice daily. Do clinical assessment if your condition presisted or worsens in the next few days
What are the causes of Skin changes ? 

• Skin allergy
• Eczema
• Bacterial infection
• Sexually transmitted diseases
• Fungal infection
• Sweating
• humid atmosphere
• Viral infection

What Should you do at the moment ?
You should follow the tips and advice provided to relieve skin color changes of the skin If there is no improvement as you should consult your dermatologist for assessment for eczema