Your dream is rich with symbolism and emotional depth. Here are some interpretations that might resonate with you:

1. The Setting (Hiking in the Mountains): Hiking often represents a journey, both physically and metaphorically. The mountains can symbolize challenges or aspirations in your life. Being with family suggests a supportive environment as you navigate these challenges.
2. The White Tiger: Tigers often represent strength, power, and independence, while a white tiger specifically can symbolize purity and uniqueness. The fact that it was whimpering indicates a sense of vulnerability or concern, perhaps reflecting your own feelings of needing to care for something or someone.
3. Fading Stripes: The fading black stripes of the tiger could symbolize a loss of identity or strength. This may relate to your fears about losing something that is important to you or witnessing someone around you who is struggling with their own identity. Your desire to help the tiger suggests a nurturing side of you, indicating that you care deeply about others' well-being.
4. Your Mother's Role: Your mother, being a doctor in the dream, may represent wisdom and guidance. Her suggestion of a skin condition could reflect your own concerns about vulnerability, especially considering your sensitivity to skin issues. This could symbolize your anxieties about personal health or changes in your life that feel beyond your control.
5. Triangle Pattern Rash: The rash could represent an underlying concern or fear manifesting in your waking life. The triangle pattern may symbolize stability but can also be associated with change, as triangles are often seen in transformation processes.
6. Emotional Connection: Overall, this dream seems to reflect your compassion and your fears regarding health and identity—both your own and those of others. It may suggest you are at a point where you’re processing your feelings about vulnerability and the importance of support systems.

Advice: Consider taking time to reflect on your current life challenges and the support you have from loved ones. It might be beneficial to explore any anxieties you have regarding health or identity, whether personal or concerning those close to you. Engaging in open discussions with family or friends about these feelings could also provide clarity and reassurance.